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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737cb2590a5e4644c16bc0809670477e18e6aec05a44050efc5935d535da7d18' 
  AND token = 'nsIYXJjmoSgpg84I8g53U4IVbknv2BQAcPx7Yf51+qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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