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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abcbd435319fc909daaf3285f06739534ba7ff91875476cb3752af1c8a18690c' 
  AND token = 'e44JaeiNUbuWNjW6Bwqch1+PEX7cXd4gUNrSi/nYW74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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