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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaa20e47d98305dc007b4ad90fc3a395fb68570e3eefb52cd4e7c9378269c47' 
  AND token = 'rm5f+HQ1IrTFmEYOaPRj7PJtsfyxliIaIqSXa1vdakU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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