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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca300919f024fe983df955525b72f5f62dcafc02e35633d1e133d211480b2515' 
  AND token = 'AKNVVahboN8pu3VcBD9KMD0/1aooxwSn3YkqpDfXZ88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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