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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b96fda1c0f7e9cc997b19aa0858e089d87be1cc5f6ddbb529997a99817902f' 
  AND token = '7yloi2hs9kffa85va19c3WwHmnScE06QRVKXM2uBuME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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