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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '722dd1455b7941a90c087d61e79ba2a0c1186e85ca74c03f4f28890489bf9496' 
  AND token = 'dXP3L2wfUBYEs0H0eMF2xWj2o5yRtsgYpU2QubDsGAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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