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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83661bc62e49686ce28ab9983c5a5d07eafc950e96a0945283b5649499ea22f' 
  AND token = 'RZo87Hl0IIquBlio93m8yRHahoJIJcdaBCng3oF6Jdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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