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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce46e7ea10a1e960912c2c9d5565b710c2cdafba6426635ee540fe3f4f88a710' 
  AND token = 'X5Q+xMIUT+SRLqqTBQhSC8F6ym1SQwVm3pMLbMjuZvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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