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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966359d806aa666c5695e57e854796cd14afe6c286ab43a194ec9a09a4a5e66c' 
  AND token = '6qxf5iOWaRJCrPLMPTAirVhPCq2Hj1EF5wKlgIqUKjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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