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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8b1d265f35f98124bf0c43473646c6de90a64fd0ece8d8b9f90a7ed0cb7845' 
  AND token = 'uPnT9z6s7eSckOPlfSRin/lOfGHEYpnFkQ2oSPeFis8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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