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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34350325b3b098cea6e91eb40a02da1872c017f85c06681cd994f9af82cdcb6d' 
  AND token = 'gSp+08aN+Y5k+vUp6+E6uxL/MU/9qtr7ijyN1+PCuUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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