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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e2bc5b7ac3f79dc5e1ce55c9335cd65b88fd0e577ef416fcae8739723fb8b2' 
  AND token = 'TL1E+yo8Klq6m2MmyQj8+YkQ00eAbe/ZJ4jEaFephH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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