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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71695fd88a7af7437611c43e1af34c31957786183a7e4e45d7e3f3a154b8f92' 
  AND token = 'P/1kp+VmHvPEk/6ocwSfppYxwbU8R7wGTHB88C5OQjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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