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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945f723bbffc4b0528cb3a79274897615fb757003bf6c8c0f5f94154430a8f71' 
  AND token = '50um5+VKL7F24Sx1g3uvpEP4Bj6FhBdbBBq777za8z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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