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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefc68638379faaf5a1207bcd67b7a7d89a4c62b27a378c8276e55d30b968e3e' 
  AND token = '9pu5ZmX3SFAkIoCu9XP8i8fF+63360HTK7fUmaYSHu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}