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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24584f7fb3a1e0279fcf1511f82c56b7da7babd802ca5a53ed3f807dbf7147b8' 
  AND token = 'rxUsum+fKauMec/7Pf74dh4MWP5z17/ofehWyJyxu2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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