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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b0ee7aaf7b177ae43a7513e308e8bac0534d4a33a792857864d8263c28a8bc' 
  AND token = 'QdwK7NJ3OUG/Dni3Lj+Bgj3ZdyE9bxy3eDZ+MweHp9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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