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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27995d0d83c4a51494543cde8af3903328d2d243d5c22e4c84e3d919903ff68e' 
  AND token = 'e4Ri+xI/kDj4Z2eyDsJB+b6px/Bam7wajC0vLA7+1zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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