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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4e79b332dc305ab87fb3640884cfdc2462be265bdbac518cc657372b19b4f8' 
  AND token = 'LaEsB3uqbxL9MwNIgddbeOp0PxxEZtxfo5Q7EXwkLRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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