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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b19081997754503c084f8f2b149d374d5eaf0d064e1cffa7c81fa91a6b971c' 
  AND token = '/9ktvEyRKz+81Erkl4JbZl07aZyDFxyzYfEXG3p3TmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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