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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f31f18fb26f9bb3082a9e06a9185c7ab9c9a24b63fcf787606fabba0f74f41f' 
  AND token = 'dci3gV0vkmWy29mG7VfPOvKEUQIXX8GnUaVWj/UFVXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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