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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca70904a4568d3c9d0719320ce83a49857c6d1c1dd35500e691bf90c2d20c3d' 
  AND token = 'BNQoChOu/fhj8MELeOlhgSqOasY08rlXYKqVRvC/3ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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