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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093dd012655fe80b3cb5e91a95b4dda565116843dcc9a78df2ab2d1a98cd1d31' 
  AND token = 'i0D20iQiI8GvoLAOy0om7rRxtzZn141d08T9zspztaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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