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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f291c04a669498c4a5eb7dc59f4bb26449eb7ae6f9744e03cff38ee3fd6943' 
  AND token = '9/yeIwxfHU2/I8oZf3q4VgVsE0oDshewPNFitJwcUo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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