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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89668bb3b87734f40a15e1403536a22c6f87bc5e1e2c2932f952ce24200841c7' 
  AND token = 'tjS1mb3MgVVE/3p2hs85ohtkmWdHNqtV8YlYmNKSH24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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