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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6f7b5383d57e4457f7cc2a635fcf5c1b3e906ef5f91b80f1b1bccc0571afbf' 
  AND token = 'IIyrr033i2/82dUYjO+1S7n7wzNPpR3T2ZoFVlPCng4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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