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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303cfbe8800640dca5f77b2f1ae3a41398553af5169f688f4b58032a31aabb90' 
  AND token = 'gLT2anUitX07sx2H4yvnRmhX9Pyfg4Nm9/n+sd/FKUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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