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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ee63d086af5dcb848f41622c85bf1b7a48e4be869573fb45d8aaacef68f1ec' 
  AND token = 'i4ARAd5GF6AS/6Chlws6f47NIbtJyCqR7CX4H0+YoMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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