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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564c10c376a642fd9d463f2d0471d347c10b3f95460f0778f8c87b32a291aada' 
  AND token = 'UldH7/Oy/lMDbwVMcR7HTlV9J03Ubl6HKjXoa4ODVDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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