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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e9c451026cd62d16f528045cbb803d5613d2e76e9062ea8e2ad7550d55193f3' 
  AND token = 'Qi+aieCQDMKvKWTrzc1hNxz5cGd+vJV5DwPKoxordho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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