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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a18fbb57192b17fbebdec9d850d615f61b1c867007eb3d4746c6382d0d2780e' 
  AND token = 'myniNTPH6YeTccCr8/9Nli9f46ddswqjr+WOnvmC7Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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