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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27df08e904dcf1f0145a1e0694a46579b6d8af3f1b482d52cb58ba3971157ea' 
  AND token = '2RJRR0HKofjkA/q/VD8YLIifw7d3qNFsoNvhoR8kzdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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