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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26df6b6035518e5aec24ccc4634a7f8aab2d95165d0bae62dce435e14849d4c' 
  AND token = 'iSihTGksBPd7ZcyTwM90GNw1bxUfdrGwYknD/iJxdD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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