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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dca1a5eb439915fe48ea1cfd9f9aede75d965dc52d90a64ff1efb859d63085a' 
  AND token = 'wSBG/XKZ2WBPgEIrBnxh095KT05RKF7YbidE8KmNFYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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