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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd9aac3282e5a8e115659644e0fe1849dea8190e8d9e02283fcdb7dc2236d3a' 
  AND token = 'ojgcsMn9JuusE/zSSlnESmdwQj5xhv9/XY3MrONz5Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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