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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d0104240e1429a97d395c977faa0ba0be2f6b9c931dd19b153684217569ccc' 
  AND token = '6n70rma+e34P7m8mz1R4M62tLrtqaCi6sdzF5onysN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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