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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632117c43e3a977c126bba93376756cc2c554bfab16d78a7d4e55a3a1bcff1e3' 
  AND token = 'i8bGxR7kJ3HOB0PDYJe6kz9TZXcOkqvjldndJtNVKsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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