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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eeccd4ea4671877f8c408e833ff70431c89f88d147dd60b3db41f185b6b0286' 
  AND token = 'C40oJXruhljmdOJvSN88vF9SCNby7UpWi+xK+CFG9Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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