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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d10106085518ba79cf1ede8a82e5f823372f4e31d76825861b68e5fc9743e6' 
  AND token = '8Ux9GyArMZSMD8b0SrQW1kgCiPHBbsyS+6zLqUSFAQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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