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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d05650a620c372d9d759bd1cd62493fe52574818f4e8eab88bb59bfff803be' 
  AND token = 'El8y2h/KHAgWDUMTBTD14IbQ2y8z2M4VYBCNu1tpvdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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