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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a3de92e7e8a2cedbe0def7753c6934a564a6407a7ca27cedccf9f9f0aeb085' 
  AND token = 'MqnzpjGBt57maNAh5PC+spkBOQYz6mV2oU0eQKNQthc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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