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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2750659cb7f5ee99e5ab0c20ff73099dee4773e4b533f3186e40b6135141d8b4' 
  AND token = '3WVy5dVMfPIK1gQD88ukqmJSzZTbjsNLdM3QKfm6LCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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