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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944365db7c443eb1520597c1d6958675c1da95009ce518e22d33411a34cba2ea' 
  AND token = 'ZAOOwhj8t4vfmlckJhPXeeG4bXiFervWSCGYEu2s/sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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