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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72708613a9180da3ef277df6f6eafc0ce8d8d21dae7cad44764b10a1753a1d74' 
  AND token = 'LMNU6cWtRjoZzULma89AsYCEbGhCVO04K3dBwK/JniE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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