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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d6f8d9618ebdc39a5cf9aed88afabff2a3401f7e9a3adf4bc74becaea4d7fb' 
  AND token = 'n/83Lh/tGGyPnwdlp6O0516Va7rUXJtbcyfp7ank1wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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