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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7141b312415bbed8f27c90141e6d9f8d356227505dbad3402e6349b366a26a3' 
  AND token = 'IIrJ/S+deefwvqydizTehkZvKOAc1Vb5/pxOI0X+P4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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