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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e938c49f141b1d69fb23af2ff77ed44de26c89ed877dd6b9753816824f7bd32b' 
  AND token = 'jxI7F5y+pPurSDFx0rJENZ9hbTLzGD+tbR+9XTr5KB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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