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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ed0ef245d8a40be70aa14f8068b7252f6925f0a18f6b6000f15991919a646e7' 
  AND token = '3WBy/oeUoWOFdu6qy7U0dnfRS85ZR47qpTZwwGmFemk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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