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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a688da8a66bf1c5b3a5bd94a1600a170dde9953f30255d0b44d55dfaa191e70' 
  AND token = 'j1oK7U4E38xCiB8vxPhAz7l+O9PaUShPQpO9Y6b3sqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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