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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5970a1fefbf0dc331f0993ac1cc22c6ffe8640bed5353604f126a103aadabbb' 
  AND token = '68f288UT3MW5QEgfpHM3n9wjt2qES2g+WoE7XwUj7ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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