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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb8ac7d53e8b0c9a6dcfc6f4dc60535c6391b32898bfcfaef11af85e530b514' 
  AND token = 'bvRW2F+iRwd2yxLC6CU7Q869D42OkLCLPUeRtAxskBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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