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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4014797a27b9bf5ec4a176d9e5b223c5f935caec58860ae8bf54c88c57a6023a' 
  AND token = '+RS2nLVcm7P4haw+IKhxxx7S5+MgfKMs9rOSisQlxKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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