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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072f20cfc234784fdeaf244351dfe19c16db04364cef4cfe11ea4766fa0b2c1a' 
  AND token = '0Qi9aW7m23HMluoCdaeIPDCQ1FtPp8v8FqGs46M+cmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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