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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59a8343543d6fea637284ff442f3d564e1833c42cef51842b87cfadc7f9bb81' 
  AND token = '40Dy2y3+k4HBP6PM5z9k2i8gyE2wMBkAI/trnNLQAhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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