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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cddef0b12c25184771a180c36139fc1cc8f292015115906a312eca9fc58d2a' 
  AND token = 'B8wZiOYa3Z7El9UcnhLy8SVmbqGsKS9yGoefGt05u4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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