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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bf26d6bdc31f3a7112993be7facab90a75350513d98d2dc06a111c300a0826' 
  AND token = 'OH1N4TfpqdSHWBxdxgO4NPDsewPAH4I5RxX+/8D6woQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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