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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747e103ee436cca43c02d08d62c4eee4f3e6a74d17554d9e460270b6d93906f3' 
  AND token = 'WZz+xTerXoMV3+XXdkEEmYy05yNuVBhvPR0HlOhaNPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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