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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156c2154eebc6c71549e6ca63f31a52f09efdfe24a84ffc3753b0313dfe47ec8' 
  AND token = 'FyBTl2urCvonBtS99rksVP7tFbU4Mwr0xoFb8g4s1GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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