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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e1d5b70bb15b88a5ca52ad68fffbf580113a9ab529d9f60afbfd19b152372e' 
  AND token = 'f73AOf+0MA/WP6X43Mr/KXm65oEaJuY9fRn9gziXkh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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