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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d3d5865bdd20d1c183da25886e5dd9be736ff10c245c9f7912adca2025568e' 
  AND token = 'eT2sdznUvX40iIpX3fdoMD6ayZgjwcYrvoqU9yfk7QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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