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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8768883e1a2d8bfdbdc95264549ab0649fbc7abff07137485a26e7bc6ae50d' 
  AND token = '+pI0NJRtaL+56tRCWRC64XOtLXfqizsXMXM7gEhGoxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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